[linux-block.git] / fs / lockd / svcsubs.c

/*
 * linux/fs/lockd/svcsubs.c
 *
 * Various support routines for the NLM server.
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/in.h>
#include <linux/mutex.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfsd/nfsfh.h>
#include <linux/nfsd/export.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/lockd/sm_inter.h>

#define NLMDBG_FACILITY		NLMDBG_SVCSUBS


/*
 * Global file hash table
 */
#define FILE_HASH_BITS		7
#define FILE_NRHASH		(1<<FILE_HASH_BITS)
static struct hlist_head	nlm_files[FILE_NRHASH];
static DEFINE_MUTEX(nlm_file_mutex);

#ifdef NFSD_DEBUG
static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
{
	u32 *fhp = (u32*)f->data;

	/* print the first 32 bytes of the fh */
	dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
		msg, fhp[0], fhp[1], fhp[2], fhp[3],
		fhp[4], fhp[5], fhp[6], fhp[7]);
}

static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
	struct inode *inode = file->f_file->f_path.dentry->d_inode;

	dprintk("lockd: %s %s/%ld\n",
		msg, inode->i_sb->s_id, inode->i_ino);
}
#else
static inline void nlm_debug_print_fh(char *msg, struct nfs_fh *f)
{
	return;
}

static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
{
	return;
}
#endif

static inline unsigned int file_hash(struct nfs_fh *f)
{
	unsigned int tmp=0;
	int i;
	for (i=0; i<NFS2_FHSIZE;i++)
		tmp += f->data[i];
	return tmp & (FILE_NRHASH - 1);
}

/*
 * Lookup file info. If it doesn't exist, create a file info struct
 * and open a (VFS) file for the given inode.
 *
 * FIXME:
 * Note that we open the file O_RDONLY even when creating write locks.
 * This is not quite right, but for now, we assume the client performs
 * the proper R/W checking.
 */
__be32
nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
					struct nfs_fh *f)
{
	struct hlist_node *pos;
	struct nlm_file	*file;
	unsigned int	hash;
	__be32		nfserr;

	nlm_debug_print_fh("nlm_file_lookup", f);

	hash = file_hash(f);

	/* Lock file table */
	mutex_lock(&nlm_file_mutex);

	hlist_for_each_entry(file, pos, &nlm_files[hash], f_list)
		if (!nfs_compare_fh(&file->f_handle, f))
			goto found;

	nlm_debug_print_fh("creating file for", f);

	nfserr = nlm_lck_denied_nolocks;
	file = kzalloc(sizeof(*file), GFP_KERNEL);
	if (!file)
		goto out_unlock;

	memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
	mutex_init(&file->f_mutex);
	INIT_HLIST_NODE(&file->f_list);
	INIT_LIST_HEAD(&file->f_blocks);

	/* Open the file. Note that this must not sleep for too long, else
	 * we would lock up lockd:-) So no NFS re-exports, folks.
	 *
	 * We have to make sure we have the right credential to open
	 * the file.
	 */
	if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
		dprintk("lockd: open failed (error %d)\n", nfserr);
		goto out_free;
	}

	hlist_add_head(&file->f_list, &nlm_files[hash]);

found:
	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
	*result = file;
	file->f_count++;
	nfserr = 0;

out_unlock:
	mutex_unlock(&nlm_file_mutex);
	return nfserr;

out_free:
	kfree(file);
	goto out_unlock;
}

/*
 * Delete a file after having released all locks, blocks and shares
 */
static inline void
nlm_delete_file(struct nlm_file *file)
{
	nlm_debug_print_file("closing file", file);
	if (!hlist_unhashed(&file->f_list)) {
		hlist_del(&file->f_list);
		nlmsvc_ops->fclose(file->f_file);
		kfree(file);
	} else {
		printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
	}
}

/*
 * Loop over all locks on the given file and perform the specified
 * action.
 */
static int
nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
			nlm_host_match_fn_t match)
{
	struct inode	 *inode = nlmsvc_file_inode(file);
	struct file_lock *fl;
	struct nlm_host	 *lockhost;

again:
	file->f_locks = 0;
	for (fl = inode->i_flock; fl; fl = fl->fl_next) {
		if (fl->fl_lmops != &nlmsvc_lock_operations)
			continue;

		/* update current lock count */
		file->f_locks++;

		lockhost = (struct nlm_host *) fl->fl_owner;
		if (match(lockhost, host)) {
			struct file_lock lock = *fl;

			lock.fl_type  = F_UNLCK;
			lock.fl_start = 0;
			lock.fl_end   = OFFSET_MAX;
			if (posix_lock_file(file->f_file, &lock, NULL) < 0) {
				printk("lockd: unlock failure in %s:%d\n",
						__FILE__, __LINE__);
				return 1;
			}
			goto again;
		}
	}

	return 0;
}

/*
 * Inspect a single file
 */
static inline int
nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
{
	nlmsvc_traverse_blocks(host, file, match);
	nlmsvc_traverse_shares(host, file, match);
	return nlm_traverse_locks(host, file, match);
}

/*
 * Quick check whether there are still any locks, blocks or
 * shares on a given file.
 */
static inline int
nlm_file_inuse(struct nlm_file *file)
{
	struct inode	 *inode = nlmsvc_file_inode(file);
	struct file_lock *fl;

	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
		return 1;

	for (fl = inode->i_flock; fl; fl = fl->fl_next) {
		if (fl->fl_lmops == &nlmsvc_lock_operations)
			return 1;
	}
	file->f_locks = 0;
	return 0;
}

/*
 * Loop over all files in the file table.
 */
static int
nlm_traverse_files(struct nlm_host *host, nlm_host_match_fn_t match)
{
	struct hlist_node *pos, *next;
	struct nlm_file	*file;
	int i, ret = 0;

	mutex_lock(&nlm_file_mutex);
	for (i = 0; i < FILE_NRHASH; i++) {
		hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) {
			file->f_count++;
			mutex_unlock(&nlm_file_mutex);

			/* Traverse locks, blocks and shares of this file
			 * and update file->f_locks count */
			if (nlm_inspect_file(host, file, match))
				ret = 1;

			mutex_lock(&nlm_file_mutex);
			file->f_count--;
			/* No more references to this file. Let go of it. */
			if (list_empty(&file->f_blocks) && !file->f_locks
			 && !file->f_shares && !file->f_count) {
				hlist_del(&file->f_list);
				nlmsvc_ops->fclose(file->f_file);
				kfree(file);
			}
		}
	}
	mutex_unlock(&nlm_file_mutex);
	return ret;
}

/*
 * Release file. If there are no more remote locks on this file,
 * close it and free the handle.
 *
 * Note that we can't do proper reference counting without major
 * contortions because the code in fs/locks.c creates, deletes and
 * splits locks without notification. Our only way is to walk the
 * entire lock list each time we remove a lock.
 */
void
nlm_release_file(struct nlm_file *file)
{
	dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
				file, file->f_count);

	/* Lock file table */
	mutex_lock(&nlm_file_mutex);

	/* If there are no more locks etc, delete the file */
	if (--file->f_count == 0 && !nlm_file_inuse(file))
		nlm_delete_file(file);

	mutex_unlock(&nlm_file_mutex);
}

/*
 * Helpers function for resource traversal
 *
 * nlmsvc_mark_host:
 *	used by the garbage collector; simply sets h_inuse.
 *	Always returns 0.
 *
 * nlmsvc_same_host:
 *	returns 1 iff the two hosts match. Used to release
 *	all resources bound to a specific host.
 *
 * nlmsvc_is_client:
 *	returns 1 iff the host is a client.
 *	Used by nlmsvc_invalidate_all
 */
static int
nlmsvc_mark_host(struct nlm_host *host, struct nlm_host *dummy)
{
	host->h_inuse = 1;
	return 0;
}

static int
nlmsvc_same_host(struct nlm_host *host, struct nlm_host *other)
{
	return host == other;
}

static int
nlmsvc_is_client(struct nlm_host *host, struct nlm_host *dummy)
{
	if (host->h_server) {
		/* we are destroying locks even though the client
		 * hasn't asked us too, so don't unmonitor the
		 * client
		 */
		if (host->h_nsmhandle)
			host->h_nsmhandle->sm_sticky = 1;
		return 1;
	} else
		return 0;
}

/*
 * Mark all hosts that still hold resources
 */
void
nlmsvc_mark_resources(void)
{
	dprintk("lockd: nlmsvc_mark_resources\n");
	nlm_traverse_files(NULL, nlmsvc_mark_host);
}

/*
 * Release all resources held by the given client
 */
void
nlmsvc_free_host_resources(struct nlm_host *host)
{
	dprintk("lockd: nlmsvc_free_host_resources\n");

	if (nlm_traverse_files(host, nlmsvc_same_host)) {
		printk(KERN_WARNING
			"lockd: couldn't remove all locks held by %s\n",
			host->h_name);
		BUG();
	}
}

/*
 * Remove all locks held for clients
 */
void
nlmsvc_invalidate_all(void)
{
	/* Release all locks held by NFS clients.
	 * Previously, the code would call
	 * nlmsvc_free_host_resources for each client in
	 * turn, which is about as inefficient as it gets.
	 * Now we just do it once in nlm_traverse_files.
	 */
	nlm_traverse_files(NULL, nlmsvc_is_client);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/lockd/svcsubs.c
	3	*
	4	* Various support routines for the NLM server.
	5	*
	6	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
1da177e4 LT	9	#include <linux/types.h>
	10	#include <linux/string.h>
	11	#include <linux/time.h>
	12	#include <linux/in.h>
353ab6e9	13	#include <linux/mutex.h>
1da177e4 LT	14	#include <linux/sunrpc/svc.h>
	15	#include <linux/sunrpc/clnt.h>
	16	#include <linux/nfsd/nfsfh.h>
	17	#include <linux/nfsd/export.h>
	18	#include <linux/lockd/lockd.h>
	19	#include <linux/lockd/share.h>
	20	#include <linux/lockd/sm_inter.h>
	21
	22	#define NLMDBG_FACILITY NLMDBG_SVCSUBS
	23
	24
	25	/*
	26	* Global file hash table
	27	*/
07ba8063	28	#define FILE_HASH_BITS 7
1da177e4	29	#define FILE_NRHASH (1<<FILE_HASH_BITS)
07ba8063	30	static struct hlist_head nlm_files[FILE_NRHASH];
353ab6e9	31	static DEFINE_MUTEX(nlm_file_mutex);
1da177e4	32
0bbacc40 CL	33	#ifdef NFSD_DEBUG
	34	static inline void nlm_debug_print_fh(char msg, struct nfs_fh f)
	35	{
	36	u32 fhp = (u32)f->data;
	37
	38	/* print the first 32 bytes of the fh */
	39	dprintk("lockd: %s (%08x %08x %08x %08x %08x %08x %08x %08x)\n",
	40	msg, fhp[0], fhp[1], fhp[2], fhp[3],
	41	fhp[4], fhp[5], fhp[6], fhp[7]);
	42	}
	43
	44	static inline void nlm_debug_print_file(char msg, struct nlm_file file)
	45	{
225a719f	46	struct inode *inode = file->f_file->f_path.dentry->d_inode;
0bbacc40 CL	47
	48	dprintk("lockd: %s %s/%ld\n",
	49	msg, inode->i_sb->s_id, inode->i_ino);
	50	}
	51	#else
	52	static inline void nlm_debug_print_fh(char msg, struct nfs_fh f)
	53	{
	54	return;
	55	}
	56
	57	static inline void nlm_debug_print_file(char msg, struct nlm_file file)
	58	{
	59	return;
	60	}
	61	#endif
	62
1da177e4 LT	63	static inline unsigned int file_hash(struct nfs_fh *f)
	64	{
	65	unsigned int tmp=0;
	66	int i;
	67	for (i=0; i<NFS2_FHSIZE;i++)
	68	tmp += f->data[i];
	69	return tmp & (FILE_NRHASH - 1);
	70	}
	71
	72	/*
	73	* Lookup file info. If it doesn't exist, create a file info struct
	74	* and open a (VFS) file for the given inode.
	75	*
	76	* FIXME:
	77	* Note that we open the file O_RDONLY even when creating write locks.
	78	* This is not quite right, but for now, we assume the client performs
	79	* the proper R/W checking.
	80	*/
52921e02	81	__be32
1da177e4 LT	82	nlm_lookup_file(struct svc_rqst rqstp, struct nlm_file *result,
	83	struct nfs_fh *f)
	84	{
07ba8063	85	struct hlist_node *pos;
1da177e4 LT	86	struct nlm_file *file;
1da177e4 LT	87	unsigned int hash;
52921e02	88	__be32 nfserr;
1da177e4	89
0bbacc40	90	nlm_debug_print_fh("nlm_file_lookup", f);
1da177e4 LT	91
	92	hash = file_hash(f);
	93
	94	/* Lock file table */
353ab6e9	95	mutex_lock(&nlm_file_mutex);
1da177e4	96
07ba8063	97	hlist_for_each_entry(file, pos, &nlm_files[hash], f_list)
1da177e4 LT	98	if (!nfs_compare_fh(&file->f_handle, f))
	99	goto found;
	100
0bbacc40	101	nlm_debug_print_fh("creating file for", f);
1da177e4 LT	102
1da177e4 LT	103	nfserr = nlm_lck_denied_nolocks;
f8314dc6	104	file = kzalloc(sizeof(*file), GFP_KERNEL);
1da177e4 LT	105	if (!file)
	106	goto out_unlock;
	107
1da177e4	108	memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
89e63ef6	109	mutex_init(&file->f_mutex);
07ba8063	110	INIT_HLIST_NODE(&file->f_list);
68a2d76c	111	INIT_LIST_HEAD(&file->f_blocks);
1da177e4 LT	112
	113	/* Open the file. Note that this must not sleep for too long, else
	114	* we would lock up lockd:-) So no NFS re-exports, folks.
	115	*
	116	* We have to make sure we have the right credential to open
	117	* the file.
	118	*/
	119	if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {
f0737a39	120	dprintk("lockd: open failed (error %d)\n", nfserr);
1da177e4 LT	121	goto out_free;
	122	}
	123
07ba8063	124	hlist_add_head(&file->f_list, &nlm_files[hash]);
1da177e4 LT	125
	126	found:
	127	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
	128	*result = file;
	129	file->f_count++;
	130	nfserr = 0;
	131
	132	out_unlock:
353ab6e9	133	mutex_unlock(&nlm_file_mutex);
1da177e4 LT	134	return nfserr;
	135
	136	out_free:
	137	kfree(file);
1da177e4 LT	138	goto out_unlock;
	139	}
	140
	141	/*
	142	* Delete a file after having released all locks, blocks and shares
	143	*/
	144	static inline void
	145	nlm_delete_file(struct nlm_file *file)
	146	{
0bbacc40	147	nlm_debug_print_file("closing file", file);
07ba8063 OK	148	if (!hlist_unhashed(&file->f_list)) {
	149	hlist_del(&file->f_list);
	150	nlmsvc_ops->fclose(file->f_file);
	151	kfree(file);
	152	} else {
	153	printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
1da177e4	154	}
1da177e4 LT	155	}
	156
	157	/*
	158	* Loop over all locks on the given file and perform the specified
	159	* action.
	160	*/
	161	static int
f2af793d OK	162	nlm_traverse_locks(struct nlm_host host, struct nlm_file file,
f2af793d OK	163	nlm_host_match_fn_t match)
1da177e4 LT	164	{
	165	struct inode *inode = nlmsvc_file_inode(file);
	166	struct file_lock *fl;
	167	struct nlm_host *lockhost;
	168
	169	again:
	170	file->f_locks = 0;
	171	for (fl = inode->i_flock; fl; fl = fl->fl_next) {
7117bf3d	172	if (fl->fl_lmops != &nlmsvc_lock_operations)
1da177e4 LT	173	continue;
	174
	175	/* update current lock count */
	176	file->f_locks++;
f2af793d	177
1da177e4	178	lockhost = (struct nlm_host *) fl->fl_owner;
f2af793d	179	if (match(lockhost, host)) {
1da177e4 LT	180	struct file_lock lock = *fl;
1da177e4 LT	181
1da177e4 LT	182	lock.fl_type = F_UNLCK;
	183	lock.fl_start = 0;
	184	lock.fl_end = OFFSET_MAX;
150b3934	185	if (posix_lock_file(file->f_file, &lock, NULL) < 0) {
1da177e4 LT	186	printk("lockd: unlock failure in %s:%d\n",
	187	__FILE__, __LINE__);
	188	return 1;
	189	}
	190	goto again;
	191	}
	192	}
	193
	194	return 0;
	195	}
	196
	197	/*
f2af793d OK	198	* Inspect a single file
	199	*/
	200	static inline int
	201	nlm_inspect_file(struct nlm_host host, struct nlm_file file, nlm_host_match_fn_t match)
	202	{
	203	nlmsvc_traverse_blocks(host, file, match);
	204	nlmsvc_traverse_shares(host, file, match);
	205	return nlm_traverse_locks(host, file, match);
	206	}
	207
	208	/*
	209	* Quick check whether there are still any locks, blocks or
	210	* shares on a given file.
1da177e4 LT	211	*/
1da177e4 LT	212	static inline int
f2af793d	213	nlm_file_inuse(struct nlm_file *file)
1da177e4	214	{
f2af793d OK	215	struct inode *inode = nlmsvc_file_inode(file);
	216	struct file_lock *fl;
	217
	218	if (file->f_count \|\| !list_empty(&file->f_blocks) \|\| file->f_shares)
	219	return 1;
	220
	221	for (fl = inode->i_flock; fl; fl = fl->fl_next) {
	222	if (fl->fl_lmops == &nlmsvc_lock_operations)
1da177e4	223	return 1;
1da177e4	224	}
f2af793d OK	225	file->f_locks = 0;
f2af793d OK	226	return 0;
1da177e4 LT	227	}
	228
	229	/*
	230	* Loop over all files in the file table.
	231	*/
	232	static int
f2af793d	233	nlm_traverse_files(struct nlm_host *host, nlm_host_match_fn_t match)
1da177e4	234	{
07ba8063 OK	235	struct hlist_node pos, next;
07ba8063 OK	236	struct nlm_file *file;
01df9c5e	237	int i, ret = 0;
1da177e4	238
353ab6e9	239	mutex_lock(&nlm_file_mutex);
1da177e4	240	for (i = 0; i < FILE_NRHASH; i++) {
07ba8063	241	hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) {
01df9c5e TM	242	file->f_count++;
	243	mutex_unlock(&nlm_file_mutex);
	244
1da177e4 LT	245	/* Traverse locks, blocks and shares of this file
1da177e4 LT	246	* and update file->f_locks count */
f2af793d	247	if (nlm_inspect_file(host, file, match))
01df9c5e	248	ret = 1;
1da177e4	249
01df9c5e TM	250	mutex_lock(&nlm_file_mutex);
01df9c5e TM	251	file->f_count--;
1da177e4	252	/* No more references to this file. Let go of it. */
68a2d76c	253	if (list_empty(&file->f_blocks) && !file->f_locks
1da177e4	254	&& !file->f_shares && !file->f_count) {
07ba8063	255	hlist_del(&file->f_list);
1da177e4 LT	256	nlmsvc_ops->fclose(file->f_file);
1da177e4 LT	257	kfree(file);
1da177e4 LT	258	}
	259	}
	260	}
353ab6e9	261	mutex_unlock(&nlm_file_mutex);
01df9c5e	262	return ret;
1da177e4 LT	263	}
	264
	265	/*
	266	* Release file. If there are no more remote locks on this file,
	267	* close it and free the handle.
	268	*
	269	* Note that we can't do proper reference counting without major
	270	* contortions because the code in fs/locks.c creates, deletes and
	271	* splits locks without notification. Our only way is to walk the
	272	* entire lock list each time we remove a lock.
	273	*/
	274	void
	275	nlm_release_file(struct nlm_file *file)
	276	{
	277	dprintk("lockd: nlm_release_file(%p, ct = %d)\n",
	278	file, file->f_count);
	279
	280	/* Lock file table */
353ab6e9	281	mutex_lock(&nlm_file_mutex);
1da177e4 LT	282
1da177e4 LT	283	/* If there are no more locks etc, delete the file */
f2af793d OK	284	if (--file->f_count == 0 && !nlm_file_inuse(file))
f2af793d OK	285	nlm_delete_file(file);
1da177e4	286
353ab6e9	287	mutex_unlock(&nlm_file_mutex);
1da177e4 LT	288	}
1da177e4 LT	289
f2af793d OK	290	/*
	291	* Helpers function for resource traversal
	292	*
	293	* nlmsvc_mark_host:
	294	* used by the garbage collector; simply sets h_inuse.
	295	* Always returns 0.
	296	*
	297	* nlmsvc_same_host:
	298	* returns 1 iff the two hosts match. Used to release
	299	* all resources bound to a specific host.
	300	*
	301	* nlmsvc_is_client:
	302	* returns 1 iff the host is a client.
	303	* Used by nlmsvc_invalidate_all
	304	*/
	305	static int
	306	nlmsvc_mark_host(struct nlm_host host, struct nlm_host dummy)
	307	{
	308	host->h_inuse = 1;
	309	return 0;
	310	}
	311
	312	static int
	313	nlmsvc_same_host(struct nlm_host host, struct nlm_host other)
	314	{
	315	return host == other;
	316	}
	317
	318	static int
	319	nlmsvc_is_client(struct nlm_host host, struct nlm_host dummy)
	320	{
4481d103 N	321	if (host->h_server) {
	322	/* we are destroying locks even though the client
	323	* hasn't asked us too, so don't unmonitor the
	324	* client
	325	*/
	326	if (host->h_nsmhandle)
	327	host->h_nsmhandle->sm_sticky = 1;
	328	return 1;
	329	} else
	330	return 0;
f2af793d OK	331	}
f2af793d OK	332
1da177e4 LT	333	/*
	334	* Mark all hosts that still hold resources
	335	*/
	336	void
	337	nlmsvc_mark_resources(void)
	338	{
	339	dprintk("lockd: nlmsvc_mark_resources\n");
f2af793d	340	nlm_traverse_files(NULL, nlmsvc_mark_host);
1da177e4 LT	341	}
	342
	343	/*
	344	* Release all resources held by the given client
	345	*/
	346	void
	347	nlmsvc_free_host_resources(struct nlm_host *host)
	348	{
	349	dprintk("lockd: nlmsvc_free_host_resources\n");
	350
f2af793d	351	if (nlm_traverse_files(host, nlmsvc_same_host)) {
1da177e4	352	printk(KERN_WARNING
f0737a39	353	"lockd: couldn't remove all locks held by %s\n",
1da177e4	354	host->h_name);
f0737a39 OK	355	BUG();
f0737a39 OK	356	}
1da177e4 LT	357	}
	358
	359	/*
350fce8d	360	* Remove all locks held for clients
1da177e4 LT	361	*/
	362	void
	363	nlmsvc_invalidate_all(void)
	364	{
f2af793d OK	365	/* Release all locks held by NFS clients.
	366	* Previously, the code would call
	367	* nlmsvc_free_host_resources for each client in
	368	* turn, which is about as inefficient as it gets.
	369	* Now we just do it once in nlm_traverse_files.
	370	*/
	371	nlm_traverse_files(NULL, nlmsvc_is_client);
1da177e4	372	}